SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e216fbf174d901ca58e514d21cd8090144bf4f4e66abc8f9b30ed2b9c98db490' 
  AND token = 'gdNo+KhQFEpqMdMTAe6zEZvzDacYXVbaWrkQ/gqJSBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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