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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98826e16e972c87b295f2c4ed2b306ddada86a1a22a43477838282b8f7276d3a' 
  AND token = 'v5JyQH1k9snDFCIcHre3D/637iByJ90i7p3u5LMIQ4g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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