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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21d99c8d7875f1f36a19e2b3bc35970b5b116a984aeabd1a519c8fd990c6038d' 
  AND token = '9FNoX79L4nKBbX3cHf8KGnS+OUiBO94g+/YGSJZTGUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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