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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bfdf0a537dce57d144bdc58135bcff50c5ac651b2c0760ce60e5104bd0ef10b' 
  AND token = '2YBVBhNZe5BS7/bdS6c+/U5HFp9w3wbU/COkoww+7ok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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