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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bb5936efce4925ce87407d6b1a5c6a64a2776188b3f686ee5270f88783884e4' 
  AND token = 'iR7wZoFO61Xanh87NOUG/vtJN295zkDJJkXdIkmSaUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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