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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b9652b6eff11528de1ab355ec9fd9cb7d895f6bd7a0e94e8ed7a538f8d48016' 
  AND token = 'esLvHdSxKhTX8QZ4VKisED4Xc5pYKbdI2u9xwLhLvEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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