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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97eb592f618b154d0885f1ade55e03689528657272609ca5445b6815b7a80616' 
  AND token = 'lqVxfiiGaO1OqDzuqhAgCW9RToaluIy9o5sjfHiFsgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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