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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd438cdcfe1bee7c753592a030098b61b7bf5625fa4af1e54c10a79cac39715fe' 
  AND token = '9jZZnXSocxx2905JIwqXQS9cRWYQHUnPfAMUUMK58L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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