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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792eb0e0bcc2f1bd4fd36ff295270bce5a8adb458a4ffa1960378a0ca8911d12' 
  AND token = '9MiahcatCMl+0oZQxPtDWyY0OyJPNqqCUdQPCxhGbCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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