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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1806889f529438a08a6f61bac772b8a46a7af0997ead19f3789c9d0c97281f63' 
  AND token = 'N0PRaiisxzwL63DUWYnBmdXoOg18PO5BpleYpjab0MI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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