SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71502dd01bb1922e8df1b611a4f0900b3d203dc84fb9f7a4ef31da79d8233815' 
  AND token = 'UqwkkLzYKL6+6Il9X/34BvagX91vXrQHK2ulgDXjlSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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