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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a9a84435229d5af3d740526cc452448bc08d262b34a9b55b920b4c8b334df8b' 
  AND token = 'SeAjv3/p9Q4ex43v5Bt7q4Y/nfV3yzXY5li5e0luERw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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