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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a38fc8a258546ef75ca6683f9b18fd9049fdfaa0870b290aa2f572542983c4' 
  AND token = 'lLUhqurX+ryynENkcIBwt4N+aEzaMDFABBKW+3wm5CU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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