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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed3ab409073225c046d5336e97747a8993913b2cf3d7f7801857dcae4f065df' 
  AND token = 'V5Zufj/s1uNlQtO01d/zCROc70qAuVH/JojVLEcizF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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