SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b04ec4dff84c411cf31d83e478c604cd574f540c8b1155627c0792ab87957963' 
  AND token = 'wLKPQ/pPCfG2pjLUI6TcXAupBJyhm6uN6kPUr6E/SqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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