SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b2bbfb5415a0e7b47216f64234ed26be088f5511f90dcf86d376d3d20f0e88' 
  AND token = 'TyJpDijiWMv4uwGTO/vMDmRKhYopYPcx6cI+Pn5w49I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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