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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7353597695983119338e7e1fa012c15c484d3ef0e98a639dc0708f2399d4c69f' 
  AND token = 'uSJXciBY6JFeUigI1qbnEkCikFboNNbs8Fr2g5lpP+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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