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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae342fc234ce88d119d04f747a26eaafdeb9dea9580400f4511967bd0fb19858' 
  AND token = 'JiQD3CVN2jacIKlx10usp9/o2SVkFdyn5x0cUuoT+LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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