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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b39dd53493211c6415d8946490fc78b3942264ff4cb37a14f534470977cbfd' 
  AND token = 'agxS19njtHkI6wlkUPsCkziASJhN8AV0Vzjkhrr5FfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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