SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd995ab4a11b1454a3c17c055e8a79469fc7184079a3d0f52ef21db61e8fc129a' 
  AND token = 'Yv8cTKJK6VbP4XcxgdbGuhx/11AMzVhCm+9M5nA8ZgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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