SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ab8f33b3147c763d398f405c4b6306c7c7f349a2f12dfcdea318a75ca81390' 
  AND token = 'Yw/fW7KWgha/ZbCrL4J3zbgOd+Sq1NOWoG1pfa+JTUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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