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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b525e95e13e5e59797710fc31782069dd63e4b2468c6f712ba0231e802021d5' 
  AND token = 'uIm83Hb/q0OgFTa9WFBaleFPbFoEJgIVWVceVn8gOoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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