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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db67fd095d71f8b89ebd27f013906ef7965f7d6932edb1c3b04f17f041dbd367' 
  AND token = 'vzGrDjdzVfz72wKfiD8LMSOiSLFD/SGZz/cSwjGk55M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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