SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54982a81545ec04afcd95928f11c78c231330fa26632187e367fe7ebbbd31d02' 
  AND token = '6UOzQOLBjn4EIuSrBQJUcaRHHRUjXGIPHx9lbKu7V40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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