Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '771a5b8b927175e2b22a9166ffe80948478624d62c5f293ee559861e65e0da9d' 
  AND token = 'JV91NNy6JwQazEjUhSnx3653/4DCVZIM0tujNH/VTP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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