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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef79f945974a9c435d7e9859253ed67d029602ce96654d754a6552a1a259e4c7' 
  AND token = 'Jw2EsQ74RU5//e2J4yX5AKwRHSFl0IjImMztoEqc7TU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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