SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ea1b37f9a1dec517c93d638bab72dad41ae88aefdf21682f4bf1659b4f033f7' 
  AND token = 'vwQ/WijCls6hUnLNcKdxHgVIkyr/4p8HADNBow74o+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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