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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b0a7b55ce1411ab9f9df09034cc78f99449368df1d92c0e7c0553f3f2dcd19f' 
  AND token = 'N3kLAAfDjpUC7670sbzsNeWiGjje1Fta/LbOz5mb5Pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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