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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b01c26ca6bda49f57b1eaf59ade6cc9a70930038d0b2b8b9e88fd1a785579b3' 
  AND token = 'HYmInHZLcFAspYg4FYSJfH6HLUtLsE+uFpq9WVD6oJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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