Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fef0280903963f605432742f382a89aeca5ba93db23fcf25b73e3487c746352' 
  AND token = '/4USGjPe0yj/8eQIbtZhkMm80/CfU2zwQv8qcZwBndg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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