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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61b4bbf327c3093ada12badde006fc76b3dc665d28482397014fd6a95b9f5ce' 
  AND token = 'HAZYgq3gSZQec2JbPyF3mR4Q5xwrNg4KFl8mVpSiXKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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