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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c760db55c9bf0f98c422678f72b2e6f575481b9dd67c57bbc343db30bb2b6e85' 
  AND token = 'GtchLBvzuwzYYoEyAiBrBGEveaFdn32hJG6o8wAzppo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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