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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c434d404b2f79b8286359238f4e718bce664e1e280c38525459081ec3a7366b8' 
  AND token = 'YbcFaAjYNbUVvtBTN8ZuCgs6lUhfiCOSGBNS0JrEoio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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