SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ff3722075e310ed180b8c0030d148c26464cac36c39dcef7f747963d7462a4d' 
  AND token = 'NXXz/2Fl4DeWqgyVLsZFpPu07/FGgZ6TyHKQx+GsSYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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