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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb8c75d35e36073944c8174142af70ff4fe8b0417e4406a75d6024b1b5573038' 
  AND token = 'QM/DUMm1ljyn9CZ4WP3ICvxGpzRAo1Zcak5ghar/1I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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