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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da47bd5bb3d7ae75018e1bf3fbc88c695600e07af12a601d7f2b596f8d426a6d' 
  AND token = 'gzR0yQXNJVReylYCW2S/Tg8Ezbr2JvlB+F8EexsWDp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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