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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db7e518862e52a3438b4a35ef2d8e4f654b88f33d23ac1ea59ca60a844fb009' 
  AND token = 'lqNCUn8Z4v+OPJEERbqOIdBO410AKU+BOPWZKoxessk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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