SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072235e54a2cef56bdc077031455a04fed1f9d7ed70aa5dfbe1a122b36dd29a4' 
  AND token = '+YpPqriJBWchSSZzHwsYCSfeJGJHETMBZgKAlFG9xCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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