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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5450eaa331bd882cef44138390bfe5e78a061ce46ea2106c82de754da05391ea' 
  AND token = 't/KRjAxYzHckJC6j1Y/kkl2+tBSGbgjyjPu12lOB21g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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