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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eaddbc13858fd84d98c1098857ef4779f9d885308c87d96247c4a6615cfb3dc1' 
  AND token = '6dp7dxV4x2SSVwpLguGfRS0ayhgYk7KY10fzTV8tHh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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