SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5faa7a365a2673896278bb448f4837fcceb680d57e40463fa96513d7c3298a5' 
  AND token = 'yhVOtvs1Yj8ak/6l9PYXyltL2YVduVUTp3BKXeZdBRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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