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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c8ac76a1ebf121dbe8025974e634e70c31e8968e269d63eeec076e963ffb83c' 
  AND token = 'znxGbNQ0lePqOLvwWtRB/wh5dIL0hN4qWwT/IVjHbLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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