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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028eb8bece7bc3a98b8f7a5de6bd34eff70fdbbf1c7a70ed7d40bce80bc85c9d' 
  AND token = 'ZqTw+OmRH20ou2A+0z5encLnYsjLKi+tkoROQtuuPrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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