SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a5217079571f972e5addf5bb8b1d3aa6c2c48b24675473bea06e17908290843' 
  AND token = 'VJHbruFog9lgM193hGCDVi0M2kpzKSEDFLEBYgPQb2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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