SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79aa9d310c3c6b4548c23fc2c18f58f0246c4e48aeda647e5f61d3fc41be2969' 
  AND token = 'WaFrRRDivGS4e8lq1/wWVGHJXXCokldKB+IzzSy9n1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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