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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d69eb1c726e2b550d42bdbe1b4beae65b1410b23a5e31533ab24e1bf81873c6' 
  AND token = 'ojQwVNJl3GPIFS1pldvTNKZMxFP6b45lAS391qLNdgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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