SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13145418d79ef38d86b5b2626df139fb0dfff8bdfb44b6d5e0a53a40e4af3e72' 
  AND token = 'kEoxgzxDz2+NJxUNvnOnzGqV/i+vuOEYvVhY91G+ong=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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