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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61e582c3bc55536ebed828e26350e1ee09adf902ddb8fc73d914bcc4e9a8cbea' 
  AND token = '287ALC9cZSYHc7YkE1eNCu+cZhyNHe02KsLqeVgt278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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