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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e89b847e447a3d8f3f39d70df3f523d5b8464b882a7e8bb6c79a44e9f8c97dd' 
  AND token = 'urTx0C3pzTgLJzNXlc5iBYl7jPe17od/Fm8yOgF8KeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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