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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ee568790d9160f08745db3529ecd063483eb4846b9317dba58af77dc71dfc8c' 
  AND token = 'Qmt/SfDeZc/QttOA/YPPBL9uRH+Vlgib9q++NS05pBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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