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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f540c349688a39db9789de8bbdfd9bc5aba9b5fb1d3e84b71b96675de80ac2e' 
  AND token = 'KFE/SQt8OZLaeYk/2Q4hDC4RlMWa+W3gCz4YPMmhgug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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