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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35141c24f1f7b62e70df311d12674064120f9d31b44e7543347bfd987ab57e6f' 
  AND token = '6z83E6DCXHjtV7rZFiQYiv1ZZRApS/59dfqJVle50mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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