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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '612b426304303fa98fc8faaf984bfdb806a681d38d48008e5996cba15e481d8c' 
  AND token = 'XkrmUwng9wc1ccChz+2KXz752klfbacOr3XfC0Dc/tY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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