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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aea831e8dde08ae7a8b30101bdc25ea947b379fa3fd14554d064a9efb2a210f9' 
  AND token = 'RF5urqKnTXyAbEHmAjwKZwq2la9R8rFQEpoORH1Y/78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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