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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e25ceccd6dfbd99f5f4f3c799ba66ebd29a89593090853acf8fa984d76c14d2a' 
  AND token = 'ELp9Zu9Zz7tghpWi4tqlD2XiO6voadJ6dKkEfcvWg3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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