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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93fee0813334721051a981bea4a6a007a68c64e7e430090ff70aa81c783d9f94' 
  AND token = 'RyE3G5DLTwNZd3oWyiKXBJdT9XjCkUbG6RrU5GYc0WA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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