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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c8c3ac2634176d2aa0362e4fb713c5deea1bcd7a97900f4eaa70c4043bf8a7c' 
  AND token = '0aOOJ6QKIOTzVZ5pgZmi6QYDpCtsUJ3WKKsKtGRtTVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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