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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a56998bdcef69e30a96d0bde09772925c442801faa402f751a372b1c7f7f549' 
  AND token = '2fh9m5cAlqHXiE9nDhiLwYOSpV+4iRqG/WDrgdaEH1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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