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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e3b8e030f82665980c4e97be5715d2613428de00ea480604b8081b901bfe3df' 
  AND token = '5ImNKtOVKtBI5ae+EZQodd6m6ILUNuBVt20EtE8eO5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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