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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae3ddb1bbbdd06c7607ef6efec7d16d0eb21a12d94d39bc8397892a6325795b8' 
  AND token = 'dXKES0IFt1aWB2rkJ7VIz/IQRA9DG48vKSH8nc0B/h0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}