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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e60296446eb9585d5be4a381acc845696d5674ed5b85dbed34cb67dff7657c33' 
  AND token = 'hmJ6mMyAYRuLhyQAHc9eEr3xuWlWVQd47r0HrOY3KA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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