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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8560bf79cd08d632393ee74a00cc64981500f307eb040290de17f9390c9110' 
  AND token = 'xO6PqQT0TsH7EKJ2AVfqJqOw3w2VNAof7IyhzI2mwZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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