SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a685625030c49fb3a0a8e6c66d988c95f8371cf4c8f3a5490abfa8db9e5f5b1' 
  AND token = 'dDzvJE/eFhq/mMuMoplZzPinYZVKWjD7cZIlE30xy2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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