Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f1a98251ea981573635f66e869fdd96991300ab6f3d3ab193599005d13bb887' 
  AND token = 'yUkvw+t5AWgF9+2QbpWhVwwweuG9ScNO5nCXNtgfhuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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