SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '724532466f01764b7cf14296d3cf02634744b406aa48f7fab48e17f5ae39fa56' 
  AND token = 'ZKjBDlAPPTx4Slv+15VkVuLecemJUZ66rkUwCYvoAcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00070

JSON explain

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