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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1c7eff91fa51d41919a0d610b7069377928e606c54a7a159c787a783de30667' 
  AND token = 'BJ379l8LJaRTLbWNHiCLuseA8ta5evf2mD1Qw3Bh91Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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