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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e3259ebf99a50c6c58791cf6fab24004541525e71cf84e5ed8885cf37067fd' 
  AND token = 'U7Vyzn8UKQTvE7xEG4RQf9v8ltVCvbE0jbUcjDtFu5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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