SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34b3424df55dd6641ef3ab200f8cef157fee4bfb9e56df3de26188878fb5efbf' 
  AND token = 'gYlhqVupDvknciqQ5lCzo6Ptt+YTexa9/0Ku4g/wsak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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