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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf14dbd0c3074bd47cbeb4f8f11c5ef9fadaa38ec9f77d73901ccc956c9b6241' 
  AND token = 'dvXuVAdOXRJNNarWXNHqfCc9ut4h4mf8wPFj62oOH1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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