SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9806da100bfb9879eeeafe1c625e8e9e32584d5f67e2bfacaa341f5dc81e7a33' 
  AND token = 'FxBituGl2VKVJHBSKJ5FqptWiCSMN/NovbLd7jxjDiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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