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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbc19981adb50f467cbb6916a49a65ba828ee84140f6a940ed30ad593588984c' 
  AND token = 'csq+dfp2VAm9VHJnTPh330wqOBxDJESqUIPiPCqK67I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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