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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ff5628ab64705772017a3be87bc659c71aa2ea23b88d0fe621d68ad00713bd6' 
  AND token = 'ch6P3rGa/RTJCkxG6kIMQV0t7gK6MWsTGH78rXEpacY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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