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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26837c953079c768da24a66b91b40f493ff90202ecfea3f82bd76030c57d87f' 
  AND token = 'oN9y83IPvuQ617pB84n8/vZgP5/fpnnakGtkikGOOfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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