SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5847f3fb47e3b08cfc085b9972a83b5e111392bd8d526e76f9d3dbd3a6116ee5' 
  AND token = 'bufArPwC7PzG3+fYmDE4pQIgS3zx6+fxmKBM1GCW4Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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