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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b887a49f92d1d6aa58ddc8b1fe63a2dc5f69fcdbf7d36be6991d2b30d53116a4' 
  AND token = 'WIFNwVUitxxgc41EHPnToelA3qGa7r3MrXOlasctGB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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