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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fa96caf98c4ca197164d6cf704a48ef8355e3d5c871f6e6f9c97013ca5ddc2' 
  AND token = 'tj3DpOpfwZA+7q/FD4cWtB28kknig/spwpciTio1qvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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